I've connected my macbook pro (os 10.6.8) to an external display, but it will not go into clam shell mode!  When I close the lid the laptop goes to sleep, and I am unable to wake it using the external keyboard or mouse.

A rundown of what I've tried:
Adjusting energy settings to try to prevent sleep
Pluging the USB keyboard and wacom tablet directly into the laptop (as opposed to a usb hub)
My laptop's power cable is connected
My display (a Vizio TV) is recognized in the System Preferences panel
I'd been using this TV for about a year with my older Macbook Pro (OS 10.5.8), though using a different wireless keyboard and mouse
***Update:  The issue seems to lie with the keyboard and wacom tablet.  I am trying to use a wireless Case Logic keyboard (with dongal) and wired wacom tablet to wake the Macbook Pro in clamshell mode.  To experiment, I tried using my Logitech wireless keyboard & mouse set (also dongal) that I had been using before and it wakes the computer without any problems!  However, I really need to be able to use my wacom tablet.  If I switch to the tablet after waking the computer using the Logitech keyboard & mouse it works, but once the computer sleeps it won't work anymore.  I could keep switching back and forth I suppose, but it's sort of a pain.  There has to be an easier way!  Any ideas why the wired wacom tablet is unable to wake the computer in clamshell mode?
Thanks!

So your keyboard or mouse won't wake the Mac when you close the lid correct? Try resetting the SMC and pram
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery.
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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